fix(ui): url encode item titles in issue url

[ReenigneArcher]

Description

Some item titles may not be properly quoted in the issue URL. This PR implements url quoting around the item title. I opted to use quote_plus from six to make it more similar to Python 3, which most developers are more familiar with at this point in time.

Screenshot

Issues Fixed or Closed

• Fixes issue with ThemerrDB issue urls #328

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Dependency update (updates to dependencies)
• Documentation update (changes to documentation)
• Repository update (changes to repository files, e.g. .github/...)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated the in code docstring/documentation-blocks for new or existing methods/components

Branch Updates

LizardByte requires that branches be up-to-date before merging. This means that after any PR is merged, this branch
must be updated before it can be merged. You must also
Allow edits from maintainers.

• I want maintainers to keep my branch updated

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ae60989) 69.78% compared to head (955ea98) 69.87%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #330      +/-   ##
==========================================
+ Coverage   69.78%   69.87%   +0.09%     
==========================================
  Files          12       12              
  Lines         983      986       +3     
==========================================
+ Hits          686      689       +3     
  Misses        297      297              

Flag	Coverage Δ
Linux	69.87% <100.00%> (+2.63%)	⬆️
Windows	69.87% <100.00%> (+0.29%)	⬆️
macOS	69.87% <100.00%> (+0.29%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
Contents/Code/webapp.py	66.66% <100.00%> (+0.60%)	⬆️

[zdimension]

lgtm